GB795996A - Dual push button safety control system for machines - Google Patents

Dual push button safety control system for machines

Info

Publication number
GB795996A
GB795996A GB18929/56A GB1892956A GB795996A GB 795996 A GB795996 A GB 795996A GB 18929/56 A GB18929/56 A GB 18929/56A GB 1892956 A GB1892956 A GB 1892956A GB 795996 A GB795996 A GB 795996A
Authority
GB
United Kingdom
Prior art keywords
relay
switches
switch
machine
time delay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB18929/56A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dictaphone Corp
Original Assignee
Dictaphone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dictaphone Corp filed Critical Dictaphone Corp
Publication of GB795996A publication Critical patent/GB795996A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details of starting control

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Keying Circuit Devices (AREA)

Abstract

795,996. Machinery safety devices. DICTAPHONE CORPORATION. June L9, 1956 [June 24, 1955], No. 18929/56. Class 80 (4). A two-handed safety operating device for a machine 6 comprises dual push-button switches 2, 4 which have to be closed simultaneously, or substantially so, to actuate a main contactor or relay 22 to initiate the operation of the machine. A time delay relay 21 which is set in operation when either of switches 2, 4 is actuated controls a switch 32 in series with the switches 2, 4 across the power lines 18, 20 so that whilst normally closed it opens after a short delay, governed by the discharge of a condenser 44 through a resistance 40 and the solenoid 42, to break the circuit of the relay 22. Thus if one switch 2 or 4 is operated first the switch 32 may operate before the other is subsequently operated to prevent relay 22 actuating. If both switches are operated together relay 22 will be actuated, before the time delay switch 32 is opened, to start the machine. In a modified arrangement a second time delay relay is provided to ensure that sufficient time is allowed for the main contactor or relay 22 to function after both switches 2 and 4 are closed. ______
GB18929/56A 1955-06-24 1956-06-19 Dual push button safety control system for machines Expired GB795996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US795996XA 1955-06-24 1955-06-24

Publications (1)

Publication Number Publication Date
GB795996A true GB795996A (en) 1958-06-04

Family

ID=22151562

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18929/56A Expired GB795996A (en) 1955-06-24 1956-06-19 Dual push button safety control system for machines

Country Status (1)

Country Link
GB (1) GB795996A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10360790B2 (en) * 2016-04-22 2019-07-23 Banner Engineering Corp. Safety touch button system having an intercommunications link

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10360790B2 (en) * 2016-04-22 2019-07-23 Banner Engineering Corp. Safety touch button system having an intercommunications link

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